JPH0932014A - Method of execution for retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of constructing a retaining wall, which can eliminate necessity of dismantling a form after placement of concrete, and which can enhance the strength of a weir board. SOLUTION: An embedded weir board 2 stands upright in a base part of a concrete base of a retaining wall on the slope side of a natural ground, and a decorative weir board 3 stands upright on a concrete base at a position where the weir board 3 is spaced from the weir board 2 by a predetermined distance, facing the latter, the weir boards 2, 3 being coupled together by coupling fittings 4 at arbitrary positions so as to prepare a form 1 for placing concrete for a retaining wall. The embedded weir board 2 is composed of embedded PC (precast concrete) panels 10 which are provided with fixtures 14 in the peripheral edge of a concrete placing surface thereof, and which continuously arranged vertically and horizontally, being coupled with each other by means of reinforcing steel bars 20. The decorative board 3 is composed of decorative panels 15 each of which has a decorated outer surface and a rear peripheral edge part provided with a fixture for locking a reinforcing steel bar 2, and which are continuously arranged vertically and horizontally, being coupled with one another by means of reinforcing steel bars 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weir plate for forming a retaining wall for preventing collapse of soil such as a steep slope of natural ground due to cut soil or embankment and a method for constructing the retaining wall.

[0002]

2. Description of the Related Art Generally, a retaining wall made of concrete or the like is provided on a steep slope of a natural ground formed by cutting or embankment to prevent the slope from collapsing. Conventionally, when the above retaining wall is provided, basic concrete is previously placed along the slope of the natural ground, and two weir plates are provided at a predetermined interval (corresponding to the width of the retaining wall to be formed on the basic concrete portion. (Allowed interval)
The retaining wall was formed by pouring concrete into the formwork that was opened. At the time of molding the mold, a separator is provided between the opposing barrier plates so that the barrier plates are kept at a predetermined distance. Then, hang a hydraulic jack etc. with adjustable length between the weir plate surface such as the slope of the natural ground and the slope,
The formwork is supported so that it will not fall until the cast concrete is hardened.

[0003]

However, the above-mentioned conventional formwork is troublesome because it needs to be dismantled after the concrete is hardened. Further, many of the dismantled molds are disposed of as waste materials, which is not preferable because reduction of waste is required. Further, it is required to improve the work efficiency and the accuracy of a work that requires a lot of manual work by a worker, such as a formwork assembly. Therefore, the construction method of the retaining wall of the present invention is to form a mold by connecting the decorative dam plate and the embedded dam plate with a connecting metal fitting, and without disassembling the mold after placing concrete, the strength of the dam plate It is an object of the present invention to provide a method for constructing a retaining wall with improved construction. Another object of the present invention is to provide a method for constructing a retaining wall that improves the strength of a concrete casting formwork and can easily lock the reinforcing bars arranged in a grid pattern. It is another object of the present invention to provide a method of constructing a retaining wall that improves the surface strength and aesthetics of the retaining wall and that allows the reinforcing bars arranged in a grid pattern to be easily locked. Moreover, it aims at providing the construction method of the retaining wall which can connect easily a decorative barrier plate and an embedded barrier plate.

[0004]

[Means for Solving the Problems] The method for constructing a retaining wall according to the present invention solves the above-mentioned problems, and is a method for constructing a concrete retaining wall along a slope of a natural ground or the like to prevent the collapse of earth and sand. In addition, the PC embedding panel having the member for fixing the reinforcing bar on the concrete pouring surface is continuously arranged vertically and horizontally, and the reinforcing bar is arranged in a grid on the member for fixing the reinforcing bar on the concrete pouring surface of the PC embedding panel. The embedding dam plate that locks each PC and connects each PC embedding panel, and the decorative panel with the decorative pattern on the surface and the reinforcing bar fixing member on the back side are arranged vertically and horizontally, and the back side of the decorative panel The reinforcing bars fixed to the reinforcing bar fixing member are locked at a predetermined interval with a decorative barrier plate in which each decorative panel is connected by locking the reinforcing bars arranged in a grid pattern, and a connecting metal fitting is used between the decorative barrier plate and the embedded barrier plate. Connect Concrete is cast between the decorative barrier plate and the embedded barrier plate, and the decorative barrier plate and the embedded barrier plate are buried in the cast concrete so as to be integrated with each other. While building a strong retaining wall, it was made unnecessary to dismantle the formwork after placing concrete.

The PC-embedded panel can be formed into a substantially rectangular shape of one kind selected from concrete, resin concrete, FRP and GRC to form a high-strength concrete pouring form. In order to improve the surface strength and the aesthetics of the retaining wall by forming a substantially rectangular shape with one or more layers selected from concrete, resin concrete, FRP and GRC in two or more layers. did. For both the PC-embedded panel and the decorative panel, reinforcing bar fixing members are provided on the upper and lower two sides and the right and left two sides, respectively, so that the irregularities are reversed, and the reinforcing bars arranged in a grid pattern can be easily locked. I made it possible. Further, the connecting metal fittings for connecting the decorative barrier plate and the embedded barrier plate are provided with elongated holes at positions symmetrical with respect to the bending line of the thin steel plate elastically deformed into a substantially V-shaped cross section, and the outer edge of the decorative barrier plate. 2 having a locking portion for locking the reinforcing bar and the reinforcing bar of the embedded dam plate 2
The inner end side of the two connecting rods is inserted into the two long holes of the thin steel plate bent in a substantially V-shaped cross section so that the elastic force of the thin steel plates presses the two connecting rods together to make a decorative dam plate. The embedded weir plate can be easily connected to.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for constructing a retaining wall according to the present invention will be described with reference to FIGS. The concrete pouring formwork for constructing a concrete retaining wall constructed on the slope of the natural ground that has been cut or filled, etc. is the slope side of the foundation concrete of the retaining wall, not shown. The embedding dam plate 2 is erected at the base of the embedding dam plate 2, and the makeup dam plate 3 is erected on the foundation concrete at a position opposite to the embedding dam plate 2 at a predetermined distance from the embedding dam plate 2 and the makeup dam plate 3. A connecting fitting 4 is provided at an arbitrary position between the two weir plates, and the weir plates are held at a predetermined distance. When constructing the basic concrete and the retaining wall at the same time, both dam plates should be fixed to the reinforcing bars for the basic concrete.

The embedded weir plate 2 erected on the slope side of the basic concrete has a fixing metal fitting 14 having a reinforcing bar holding portion 14a curved in a substantially chevron shape, for example, as a reinforcing bar fixing member at the peripheral edge of the concrete placing surface. The PC embedding panels 10 provided are continuously arranged vertically and horizontally, and the reinforcing bars 20 arranged in a grid pattern are locked to the fixing fittings 14 on the concrete placing surface of each PC embedding panel 10 so that each PC embedding panel 10 can be secured. It is configured by connecting.

As shown in FIG. 2, the PC embedding panel 10 constituting the embedding dam plate 2 is a substantially rectangular PC (precast concrete) plate having a concave portion 10a on the concrete pouring surface, and the concrete pouring surface. 3 pairs of groove portions 10b that are opposed to each other at the edges of the upper and lower sides that face each other.
Is provided, and the fixing bracket 14 is provided in each of the three pairs of groove portions 10b.
The curved portions of the reinforcing bar holding portion 14a are fitted to each other so that the fixing brackets 14 facing each other can hold the reinforcing bars 21 in the vertical direction of the reinforcing bars 20 provided in a lattice shape.

In addition, four fixing metal fittings 14 are arranged in two rows so as to be opposed to each other at the edge portions on the right and left sides of the concrete embedding panel 10 which face each other on two sides.
The reinforcing bar holding portion 14a of the fixing metal fitting 14 is provided so as to project from the side portion (so that the unevenness thereof is opposite to that of the fixing metal fitting 14 provided in the groove portion 10b), and the reinforcing bar of the fixing metal fitting 14 facing each other is provided. Reinforcing bar 21 in the vertical direction at the holding portion 14a
Hold the rebar 22 in the lateral direction orthogonal to the
The C-embedded panel 10 can be locked on the side of the concrete placing surface. In addition, the fixing metal fittings 1 at the edges of the two right and left opposite sides of the PC-embedded panel 10
As shown in FIG. 4, locking metal fittings 18 are provided at the positions where the four metal fittings 4 are provided, so that the fixing metal fittings 14 can be locked to the edges of the PC-embedded panel 10 with bolts or the like. There is. Alternatively, the fixing bracket 14 may be directly engaged with the side portion of the PC-embedded panel 10.

The vertical reinforcing bars 21 are pressed against the PC embedded panel 10 side by the horizontal reinforcing bars 22 and held by the fixing brackets 14.
While holding the vertical rebar 21 in the
4 may be provided with a flat plate so that the reinforcing bar 21 is locked to the side portion of the PC embedded panel 10. Further, instead of providing the fixing metal fitting 14 that holds the longitudinal reinforcing bars 21 of the PC-embedded panel 10, the groove portion 10b is formed in a fitting hole having a shape for fitting the reinforcing bars 21 when the PC-embedded panel 10 is manufactured. It doesn't matter. The concave portion 10a provided on the concrete pouring surface of the PC-embedded panel 10 can reduce the weight of the PC-embedded panel 10 and can adjust the cover thickness of the reinforcing bar 20 by adjusting the depth thereof. .

A connecting projection 11 and a fitting hole 12 are provided at opposing positions on opposite sides of the PC embedding panel 10, and each PC embedding is performed when the embedding dam plate 2 is constructed with a plurality of PC embedding panels 10. The panel 10 can be strongly connected. It should be noted that the shape of the PC-embedded panel 10 is not limited to the substantially rectangular shape, but may be formed in a substantially H shape or the like. The PC-embedded panel 10 can be made of one selected from concrete, resin concrete, FRP, and GRC, and is molded in advance in a factory or the like to improve the dimensional accuracy.

The makeup barrier plate 3 which is erected opposite to the embedded barrier plate 2 at a predetermined interval is, for example, provided with a makeup such as an uneven pattern on the surface, and fixed to the peripheral edge of the back surface for locking the reinforcing bars. The decorative panel 15 provided with the metal fittings 14 is continuously arranged vertically and horizontally, and the reinforcing bars 23 arranged in a lattice are locked to the fixing metal fittings 14 on the back of each decorative panel to connect the respective decorative panels 15. Has been done. As shown in FIG. 3, the decorative panel 15 forming the decorative barrier plate 3 is a substantially rectangular PC plate having a recess 15a on the back surface, and the edges of the back surface of the decorative panel 15 on the upper and lower sides facing each other. Is provided with three pairs of groove portions 15b opposed to each other, and the curved portions of the reinforcing bar holding portions 14a of the fixing metal fittings 14 are fitted into the three pairs of groove portions 15b, and the fixing metal fittings 14 facing each other form a grid pattern. The longitudinal reinforcing bars 24 of the reinforcing bars 23 provided in the above can be held.

Further, four fixing metal fittings 14 are arranged in two rows so as to be opposed to each other at the edge portions on the left and right opposite two sides of the rear surface of the decorative panel 15, and the curved reinforcing bar holding portion 14a of the fixing metal fitting 14 is arranged. Are provided so as to project from the side portion (the unevenness thereof is opposite to that of the fixing metal fitting 14 provided in the groove portion 15b), and the reinforcing bar holding portions 14a of the facing fixing metal fittings 14 are orthogonal to the longitudinal reinforcing bars 24. Horizontal rebar 2
5, the reinforcing bars 25 can be locked to the side portions on the back surface of the decorative panel 15. In addition, a locking metal fitting 18 is provided at a position where the fixing metal fittings 14 on the two opposite side edges of the decorative panel 15 are provided, and the fixing metal fitting 14 is provided by a bolt or the like.
It can be locked to the edge of the. Further, the fixing bracket 14 may be directly engaged with the side portion of the decorative panel 15.

The vertical rebars 24 are pressed against the decorative panel 15 side by the horizontal rebars 25 and held by the fixing brackets 14, but each fixing bracket 14 holds the vertical reinforcing bars 24. In this state, a flat plate may be provided on each fixing bracket 14 so that the reinforcing bar 24 is locked to the side portion of the decorative panel 15. Further, instead of providing the fixing metal fitting 14 holding the vertical reinforcing bars 24 of the decorative panel 15, the groove portions 15b are formed in the reinforcing bars 24 when the decorative panel 15 is manufactured.
You may form in the fitting hole of the shape which fits. The recess 15a provided on the back surface of the decorative panel 15 is
It is possible to reduce the weight of the decorative panel 15 and adjust the cover thickness of the reinforcing bar 23 by adjusting the depth thereof.

A connecting projection 16 and a fitting hole 17 are provided at opposing positions on opposite side surfaces of the decorative panel 15, so that each decorative panel 15 can be used when the embedded dam plate 3 is constructed with a plurality of decorative panels 15. It can be strongly connected. It should be noted that the shape of the decorative panel 15 is not limited to the substantially rectangular shape, but may be formed in a substantially H shape. Further, the decorative panel 15 can be formed in a single layer by using one kind selected from concrete, resin concrete, FRP and GRC, and can also be formed in a multi-layer by using two or more kinds of the above materials. , Retaining wall that is pre-molded in factories etc. to improve dimensional accuracy, and furthermore, the uneven pattern etc. provided on the surface of the decorative panel so as to be a surface finish as it is is colored and applied. The aesthetics of can be improved.

When the foundation concrete and the retaining wall are simultaneously constructed, the embedded weir plate 2 and the decorative weir plate 3 have the lower ends of the longitudinal reinforcing bars 21 and 24 of the both dam plates embedded in the embedded weir plate 2 and the decorative weir. Both dam plates can be erected by being welded and fixed to a reinforcing bar for basic concrete so as to project from the lower end of the plate 3. When the foundation concrete is first constructed and then the weir plate is erected, the reinforcing bar is projected at the position of the weir plate when constructing the basic concrete, and the projecting reinforcing bar and the embedded weir plate 2 By fixing the vertical reinforcing bars 21 and 24 of the decorative barrier plate 3 by welding, both barrier plates can be erected.

A connecting fitting 4 provided between the embedded weir plate 2 and the decorative weir plate 3 for connecting both the weir plates and keeping the distance between the both weir plates at a predetermined interval is as shown in FIG. At the outer ends of the two connecting rods 4a, 4b, hook-shaped locking members 5 are provided as locking portions for locking the reinforcing bars 20 of the embedded blocking board 2 and the reinforcing bars 23 of the decorative blocking board 3. In addition, the inner end sides of the two connecting rods 4a, 4b are inserted into the two long holes 6a of the thin steel plate 6 bent in a substantially V-shaped cross section, and the elastic force of the thin steel plate 6 causes the two connecting rods 4a, 4b. 4b is crimped. In addition, the outer ends of the connecting rods 4a and 4b are threaded and the ends thereof are screwed into a turnbuckle, and the base end of the long rod has a screw portion to be screwed into the turnbuckle, and a hook-shaped locking member is provided at the tip thereof. The base end side of the provided connecting member may be screwed into the other of the turnbuckles to extend the connecting rod 4a or the connecting rod 4b so that the length can be adjusted. in this case,
The turnbuckle can be rotated to allow fine adjustment of the length.

In order to construct a retaining wall using the embedding weir plate 2, the decorative weir plate 3 and the connecting metal fittings 4 having the above-mentioned construction, each PC embedding panel 10 is provided on the base of the foundation concrete of the retaining wall on the slope side of the ground. Reinforcing bars in which the decorative panels 15 are arranged in a grid pattern on the base concrete at opposite positions while standing up the embedded dam plate 2 connected by the reinforcing bars 20 arranged in a grid pattern. The makeup barrier plate 3 connected by 23 is raised. The locking member 5 provided at the outer ends of the two connecting rods 4a and 4b of the connecting fitting 4 at an arbitrary position between the reinforcing bar 20 and the reinforcing bar 20 of the embedding dam plate 2 and the decorative dam plate 3 facing each other. The embedded barrier plate 2 and the decorative barrier plate 3
Forming a concrete pouring formwork 1 for the retaining wall near the slope of the natural ground while connecting them and maintaining them at a predetermined interval.
At this time, the connecting metal fitting 4 grasps both ends of the thin steel plate 6 and bends the thin steel plate 6 into a substantially V shape, loosens the crimping of the connecting rods 4a and 4b, and adjusts the distance between the two connecting rods 4a and 4b. Then, when the locking member 5 is locked to the reinforcing bars on both sides, the thin steel plate 6 is returned to the original position and the connecting rods 4a and 4b are pressure-bonded to connect the decorative dam plate 3 and the embedded dam plate 2 to each other. Against the lateral pressure of concrete.

After constructing the concrete casting formwork 1 for the retaining wall, concrete is placed between the above-mentioned embedding weir plate 2 and the decorative weir plate 3, and when the placed concrete has hardened, the embedding weir. The retaining wall is completed by filling the space between the plate 2 and the slope of the ground with earth and sand. The poured concrete enters the periphery of the reinforcing bar 20 of the embedding dam plate 2 and the recess 10a of each PC embedding panel 10, and also around the reinforcing bar 23 of the makeup dam plate 3 and the recess 15a of each decorative panel 15. The concrete that has entered, the decorative dam plate 3 and the embedded dam plate 2 is strongly integrated, and the decorative dam plate 3 and the embedded dam plate 2 can be used as a structural body of a retaining wall. Further, since both the dam plates are buried, it is not necessary to dismantle the formwork after constructing the retaining wall. In addition,
The basic concrete may be constructed first or may be constructed by placing concrete simultaneously with the retaining wall.

Besides, lattice-shaped reinforcing bars 20 and 23 connecting the PC-embedded panels 10 and the decorative panels 15 to each other.
At the intersection of the vertical and horizontal rebars, bend one of the vertical or horizontal rebars in the same direction into a substantially mountain shape, and lock the rebars so that they are orthogonal to the concave portion of the curved portion. Alternatively, the reinforcing bars may be formed so that the surface positions of the reinforcing bars in the vertical direction and the horizontal direction match. In this case, the groove portions 10 provided on opposite sides of the concrete placing surface of the PC embedded panel 10
b and the grooves 15b provided on the opposite sides of the back surface of the decorative panel 15 are not provided, and fixed to the sides of the concrete embedding surface of the PC-embedded panel 10 and the back edges of the decorative panel 15. The reinforcing bar is retained by the reinforcing bar holding portion 14a of the metal fitting 14.

[0021]

According to the method for constructing a retaining wall of the present invention, concrete is poured into a concrete placing formwork in which an embedded weir plate and a decorative weir plate are connected by connecting metal fittings, and only the concrete is cured. Since the retaining wall is completed in, the construction period required for constructing the retaining wall can be shortened and labor can be saved, and the retaining wall formwork can be constructed without requiring skill in assembling. The embedding weir plate and the makeup weir plate are strong weir plates because PC embedding panels and decorative panels that are continuously arranged vertically and horizontally are connected by reinforcing bars arranged in a grid pattern. It becomes stronger than the conventional retaining wall because it becomes a structural body of the retaining wall integrated with the concrete placed in between, and the work process is reduced because it is not necessary to dismantle the formwork after hardening the concrete. In addition, since it does not use wooden formwork, it is useful for protecting natural resources, and because the formwork is not disassembled and the waste material accompanying it does not appear,
There is no cost for waste treatment, and it also helps reduce waste.

When the PC-embedded panel is made of one selected from concrete, resin concrete, FRP and GRC, it is possible to obtain a strong embedding dam plate and select a panel suitable for the construction site. be able to. The decorative panel constituting the decorative barrier plate is a panel formed by one layer selected from concrete, resin concrete, FRP, GRC, or a multilayer panel formed by using two or more of the above materials. Since the panel can be used, it is possible to select a panel suitable for various construction sites, and it is possible to improve the strength and aesthetics of the retaining wall surface. Further, the connecting metal fittings for connecting the decorative dam plate and the embedded dam plate are provided with elongated holes at positions symmetrical to the bending line of the thin steel plate elastically deformed into a substantially V-shaped cross section, and the outer end of the decorative dam plate is formed. The elastic force of the thin steel plate is obtained by inserting the inner end sides of the two connecting rods having the locking portions for locking the reinforcing bar and the reinforcing bar of the embedded dam plate into the two long holes of the thin steel plate bent in a substantially V-shaped cross section. Thus, when the two connecting rods are crimped together, the decorative barrier plate and the embedded barrier plate can be easily connected, and the time required to construct the form of the retaining wall can be shortened.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a retaining wall construction method of the present invention.

FIG. 2 is a perspective view showing a PC embedded panel.

FIG. 3 is a perspective view showing a decorative panel.

FIG. 4 is a front view of a fixture.

FIG. 5 is a plan view (a) and a front view (b) of the connecting fitting.

[Explanation of symbols]

 1 Concrete placing formwork 2 Embedded dam plate 3 Decorative dam plate 4 Connecting metal fitting 10 PC embedding panel 14 Fixing metal fitting 15 Decorative panel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigenobu Tanaka 2-14-14 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Toyoko Giken Co., Ltd. (72) Seiichi Maruyama 35-1 Kishine-cho, Kohoku-ku, Yokohama-shi, Kanagawa Inside the coral

Claims (4)

[Claims] 1. A construction method for constructing a concrete retaining wall along a slope of a natural ground for preventing collapse of earth and sand, which is a precast concrete embedded panel provided with a reinforcing bar fixing member on a concrete placing surface. (Hereinafter referred to as the PC embedded panel) is arranged vertically and horizontally, and
An embedding dam plate in which each PC embedding panel is connected by locking the reinforcing bars arranged in a grid on the concrete embedding surface of the PC embedding panel, and the reinforcing bar fixing member on the back with a decorative pattern The decorative panels provided with are arranged vertically and horizontally, and
The reinforcing bar arranged on the rear surface of the decorative panel is locked to the reinforcing bars arranged in a grid pattern to make the decorative barrier plate connected to each decorative panel face each other at a predetermined interval, and between the decorative barrier plate and the embedded barrier plate. Characterized in that concrete is placed between the decorative dam plate and the embedded dam plate by connecting with a connecting metal fitting, and the decorative dam plate and the embedded dam plate are buried in the cast concrete to be integrated. Construction method of retaining wall. 2. The PC-embedded panel is formed into a substantially rectangular shape from one kind selected from concrete, resin concrete, FRP and GRC, and the reinforcing bars are fixed to the upper and lower two sides and the right and left two sides of the PC-embedded panel, respectively. The method for constructing a retaining wall according to claim 1, wherein the member for use is provided in such a manner that the irregularities thereof are reversed. 3. The decorative panel comprises one layer or two layers or more selected from concrete, resin concrete, fiber reinforced plastic (hereinafter referred to as FRP) and glass fiber reinforced cement (hereinafter referred to as GRC). As described above, it is formed in a substantially rectangular shape, and the upper and lower two sides of the decorative panel,
The method for constructing a retaining wall according to claim 1, wherein the reinforcing bar fixing member is provided on each of the two right and left sides so that the concavities and convexities are reversed. 4. A connecting metal fitting for connecting a decorative barrier plate and an embedded barrier plate is provided with elongated holes at symmetrical positions with respect to a bending line of a thin steel plate elastically deformed into a substantially V-shaped cross section, and a decorative member at an outer end thereof. A thin steel plate in which the inner end sides of two connecting rods having locking portions for locking the reinforcing bars of the barrier plate and the reinforcing bars of the embedded barrier plate are inserted into the two long holes of the thin steel plate bent in a substantially V-shaped cross section. The method for constructing a retaining wall according to claim 1, wherein the two connecting rods are crimped by the elastic force of.